<template>
  <el-container class="home_container">
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <el-container>
      <el-aside :width="isCollpase?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">{{ toggleText }}</div>
        <el-menu
            default-active="2"
            class="el-menu-vertical-demo"
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409eff"
            unique-opened
            router
            :collapse="isCollpase"
            :collapse-transition="false"
            :default-active="activePath">
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <template slot="title">
              <i :class="iconObj[item.id]"></i>
              <span>{{ item.authName }}</span>
            </template>
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children"
                          :key="subItem.id" @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      menuList: [],
      iconObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      isCollpase: false,
      toggleText: '＜',
      activePath: '',
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList() {
      const {data: res} = await this.$http.get('menus')
      if (res.meta.status != 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    toggleCollapse() {
      this.isCollpase = !this.isCollpase
      this.toggleText = this.isCollpase ? '＞' : '＜'
    },
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style scoped>

.el-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 5px;
  align-items: center;
}

.el-header div {
  font-size: 24px;
  font-weight: bold;
  color: #fff;
  display: flex;
  align-items: center;
}

.el-header div span {
  margin-left: 10px;
}

.el-aside {
  background-color: #333744;
}

.el-aside div {
  color: #909399;
}

.el-menu {
  border-right: none;
}

.el-main {
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 8px;
}

.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  cursor: pointer;
}
</style>